In the late 1890s the government had not yet assumed the responsibility of determining pattern welded pronouns wink so the makers and dealers could call barrels whatever they wanted; often chosen for marketing rather than descriptive exactitude. Even more so for the steel barrels.

This is a late 1890s Hibbard, Spencer, Bartlett & Co. catalog page. Plain ol' damascus to 'Finest'. Note Nitro steel (introduced in 1897 for the A-2, A-1, No. 3 and Pigeon and later the No. 4 and No. 5) is not listed.

[Linked Image from photos.smugmug.com]

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